Conkeldurr #127 from Black Bolt is a holo illustration_rare card that currently sells for about $27.99 ungraded, with graded copies ranging from $18.00 at grade 7 to $1,300 at grade 10. A grade 10 copy sells for around $1,300, about 46× the $27.99 raw price, so high-grade copies are worth grading.